Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cf29bd83650f6e…

MALICIOUS

PDF

84.0 KB Created: 2021-03-16 21:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 750f3dca32b8b76e9215bf66925ac416 SHA-1: 829de53c6d577ca5bfe6e6b06240c460a7167c3e SHA-256: 66cf29bd83650f6e95ed131ad21c057c264355e3b29f08bf04cd53f12cda49a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/123?utm_term=sidereus+nuncius+italiano+pdf PDF link annotation
    • http://limaliwijug.iblogger.org/zakipisodiporolekugaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potofaw/77438269599.pdfIn PDF document text
    • http://kegenag.rf.gd/plus_messenger_apk_2019.pdfIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_a1050bca437c441a8676140ebf2a48dd.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_f0a9cccdf7964a459c2e1a481b6ee7d4.pdf?index=trueIn PDF document text
    • http://parolodase.epizy.com/98935700329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663dd7e9-4baa-44a4-81d3-a9b9a09e0d0b/99719702101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724cb216-fa45-4aec-b89e-e382f58e8edb/99265416508.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/duo_therm_rv_ac_shroud.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/towofavevikoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020a0710-ee2f-4040-8bd5-4e35b68c6d20/unix_shell_programming_yashavant_kanetkar_download.pdfIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_b2fc0512de0749ccba27cfe0ff11aece.pdf?index=trueIn PDF document text
    • http://xukitekebuza.epizy.com/iifl_wealth_report.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/meeting_minutes_agenda_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82eaadce-fc3f-48eb-84d9-05fc9ebab4dc/the_blood_of_olympus_bookscool.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/what_are_the_different_names_used_for_the_two_strands_of_dna_involved_in_transcription.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96d0327-6896-4397-8790-231b1225a808/la_biblia_catolica_completa_para_leer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb954598-5701-421b-8ec5-8a17894c0e13/diablo_reaper_of_souls_ps4_gameplay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4261431-987f-4856-81c3-7d888871464c/reading_the_bible_in_chronological_order_in_90_days.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/protestant_bible_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/53710155321.pdfIn PDF document text
    • http://loxosufodu.epizy.com/riveti.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/defence_and_counterclaim_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 5252 bytes
SHA-256: d8f5ee7b33f4be60fd57e8058368f5d09ba7bd618a204865052301ecd67d98e4
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 12560 bytes
SHA-256: 94cb367e30073e3075d46a5d2f525b8d28acbf44811778be78d6206fb8be2d77

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